Re: Cyrix M2

Tuukka Toivonen (
Fri, 25 Apr 1997 10:17:35 +0300 (EET DST)

> (Cyrix had to use FP registers for MMX to be at all compatible
>with Intel. I don't think they liked having to do it :-). Intel
>did it to save the cost of engineering their silicon to hold a
>few more registers.)

I thought that MMX uses FPU registers for compatibility; operating system
doesn't have to have special support for MMX registers: it just saves FPU
registers when switching task and MMX regs will be saved too. At least
that's what Intel said, of course :)

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